Can you tell us which component you are using to show the value? I try "Label" component with "Number" render(with "Max Fractional Digits" set) to show the memory utilization current value, it works fine.

But I am still having problems rendering "Metrics List" component. You are right, if I modify the setting "Significant Digits" from "2" to "5" and also mark as false the setting "Show unit" I get almost what I want:

But the value in the circle should be with 4 digits... 2970, how can I solve this issue?

So you expect the value should be 2.927 right? If yes, I sorry to say that, currently, it can't do that. Once you set "Significant Digits", it will make sure the number of the significant digit match the number you set, '0' will add at the end if the number of the digit is not enough.